Engine-stop.



No 775,829. PATENTED NOV. 22, 1904.

J. H. CARY. I ENGINE STOP.

APPLIGATION FILED PEB.'1 8. 1904. N0 MODEL. BSHEIIS-SHEET 2 J.9\ l E I 6 48d Q Q ff @1 F701 50} WITNESSES p, lrvvz/vrop ewfz @M M 25M ULMWM UAW 5v ATT'Y No. 775,329. PATENTED NOV. 22, 1904.

. J. -H. CARY.

ENGINE STOP.

APPLICATION FILED FEB. 18. 1904.

no MODEL. v 1 3SI-IEETS-SHEET s.

EU! P 5 3 v Fc. 'T. 74 I WITNESSES lN vEN TOP ATTV UNITED STATES PATENT OF ICE.

Patented November 22, 1904.

JAMES H. CARY, OF PROVIDENCE, RHODE ISLAND, ASSIGNOR TO THE CONSOLIDATED ENGINE STOP COMPANY, A CORPORATION OF CON- NECTICUT.

ENGINE-STOP- SPECIFICATION forming part of Letters Patent No. 775,329, dated November 22, 1904.

Application filed February 18, 1904- Serial No. 194,179. (No model.)

To all whom, it may concern:

Be it known that I, JAMES H. CARY, a citizen of the United States, residing at Providence, in the county of Providence and State of Rhode Island,have invented certain new and useful Improvements in Engine-Stops, of which the following is a specification, reference being had therein to the accompanying drawings.

My invention relates to electrically-controlled mechanisms for automatically checking the action of engines or motors, and particularly to that class of mechanism which acts through the throttle or analogous valve from some electrically-connected remote point.

The object of my invention is, besides the automatic stopping and starting of the engine or motor, the augmentation of the power and its concentration upon the valve-stem .to a greater degree than has been hitherto accomplished.

The above ends are accomplished by a mechanism comprising an electric motor and magnetic clutch actuated from a source of electrical energy and provided with suitable electrical connections.

In the accompanying drawings, which form a part of this specification, Figure 1 is a side elevation of a motor and a central vertical section of a clutch employed by my invention, showing the electrical connections diagrammatically; Fig. 2, a side elevation of my mechanism in connection with the valve of an upright compound engine; Fig. 3, a detail side view of the lower portion of the clutch mechanism; Fig. 4, asection of the latter on line :0 w of Fig. 3; Fig. 5, a top plan View of the clutch mechanism with the sprocket-wheel removed; Fig. 6, a diagrammatic view of the electrical circuits; Fig. 7, a side elevation of the automatic circuit-breaker in main-line cirmechanism, and Fig. 12 a section on line y y of Fig. 10.

Like reference characters indicate like parts throughout the views.

In the drawings, C represents a vertical ries a pinion 6, meshing with a gear 7 upon a shaft 8, horizontally mounted in aframe 9 above the motor and carrying upon its extremity a bevel-gear 10,- which meshes with a similar gear 11 upon the lower extremity of a shaft 12, vertically mounted in the frame 9 and supported by a bracket-arm 13. Keyed to the vertical shaft 12 is the hub 12' of an iron disk or wheel 14, to whose upper surface is fixed the base or yoke 15 of the magnet 16, which carries upon its extremity the polepieces 17, each of whose upper surfaces should be covered by a sheet of non-magnetic material 18, such as brass. Also mounted upon the shaft 12 above the pole-pieces is an iron disk 19, normally free to revolve loosely upon its shaft. The passage of a current through the magnet, however, makes this disk an armature. Below the armature is a loose sleeve 20, which in conjunction with a shoulder 21 upon the shaft 12 form terminal bearing-surfaces for a spiral spring 22. The lower surface of the disk 14 has an annular insulating member 24, on which is mounted contactrings 25 26, engaging, respectively, the contact-springs 27 28, vertically mounted upon an insulating-block 28. The upper margin of the disk 14 has an insulating-block 29, provided with binding parts 30 for the wires 31 32, connecting with the contact-rings. Rigidly fixed to the upper surface of the armature is a sprocket-wheel 23, which carries the chain 4, connecting with the wheel 3 on the valve-stem 1.

When the magnet 16 is energized through the wires 31 32, the armature 19 is drawn down firmly upon therotatingpole-pieces 17, and rotary movement is thereby imparted to the sprocket-w heel 23 and its connected parts. Upon the cessation of the current the spring 22 frees the armature from the magnet and the sprocket-wheel ceases to rotate. The continuance of the current through the clutch mechanism enables the motor to drive, as above described, the valve-stem 1, which by virtue of its threads meshing with those in the bracket 0 is gradually forced upwardly, thereby closing the valve 0. The upward travel of the stem 1 is checked by means of a projection 33, secured thereto above the wheel 2. After a predetermined number of revolutions of the stem the projection 33 in its advance engages a circuit-closer M, consisting of an insulating-base c, fixed to the bottom of the extension 0 on which are mounted two springs 34 35, carrying, respectively, contact-points 36 and 37. The spring 34 lies in the path of the projection 33, and when engaged by the latter the contact-point 36 is forced laterally into contact with the point 37, thereby closing the circuit and operating the clutch mechanism, thereby stopping the motor, as will be later detailed.

The electrical connections consist of the following circuits and included mechanisms: 1) is the dynamo or other source of electrical energy, and the main circuit comprises the wires 38 39, switch J, wires 41 42, switch K,

wires 44 45, retained to the base of motor A by binding-screws 46 47, and the wires 31 32, leading to the clutch mechanism. A branch circuit from Wires 41 42 comprises wire 48, coil F, (of sufficient resistance to prevent closure of the armature of the magnet 52,) wire 50, electromechanical gong G, wire 51, electromagnet 52, wire 53, circuit-breaker H, and wire 54. The customary push-buttons 55 are in this circuit intermediate the wires 48 and 50. The current passing through this circuit operates the gongGr and the circuit-closer H, which controls the clutch mechanism. Another branch circuit is that leading from the circuit-closer M, comprising the wires 56 57 58 and the electromagnet 59. These wires form a shunt to the automatic circuit-breaker J. Adjacent the magnet 59 is pivoted an armature-lever 60, whose extremity supports a pivoted gravity-latch 61, which in turn normally retains closed upon its contacts the knives 40 of a switch J. The latter when released is opened by the pressure of a springplunger 62, contacting with the under side of the switch cross-bar 63. The circuit-breaker H comprises two spring members 64 65, carrying contact-points 66 and 67, respectively.

Adjacent the circuit-breaker H is the knifeswitch K, whose projecting cross-bar 68 retains the spring against the spring 64 so long as the switch remains open. The cross-bar is provided with a projection 69, which normally rests upon the extremity of the pivoted armature 70 of the magnet 52. The switch is tensioned against the support of the armature 70 by a spring 71 beneath the rear of the blades 43 and is provided with the usual contact-points 72.

The operation of closing the valve is performed by pressing one of the push-buttons 55, located at convenient points on the premises adjacent the engine, or by the closure of the circuit through the speed-limit E. By either of these operations the resistance F will be shunted, thereby permitting free passage of the current through the circuit formed by wire 50, gong Gr, wire 51, magnet 52, wire 53, circuit-breaker H, wires 54 42, one blade of switch J, wire 39, generator 1), wire 38, the second blade of switch J, and wires 41 48. The energizing of magnet 52 releases the catch 69, closes the switch K, and thereby establishes a circuit from the generator through wires 44 45 to the motor A, thereby causing the latter to rotate the magnet 16. Simultaneously the passage of the current through the wires 31 32 energizes the magnet to operate the clutch and through sprocketwheel 23 closes the valve. The bar 68 of switch K upon its release advances and permits the springs 64 and 65, which are normally in contact, to separate. This opens the auxiliary circuit through the gong G and causes the latter to ring.

To prevent the further action of the motor A after the closure of the valve 0, the projection 33 contacts the points of circuit-closer M, as already detailed. This completes a circuit through wires 56 41, one blade of switch J, wire 38, generator D, wire 39, the other blade of switch J, wires 42 58, and the magnet 59. The current energizes the magnet 59, which attracts the adjacent portion of the pivoted armature 60. This removes the support from beneath the retaining-latch 61 and releases the blades 40 of switch J, which are forced open by the spring-plunger 62. The current is thus completely cut off from the generator, thereupon discontinuing the revolution of the motor, which has now completed the closure of the valve. The apparatus is reset by opening the switch K and closing the switch J My invention is applicable to any valve which is adapted to be operated by the revolution of the valve-stem. In Fig. 11 is shown a familiar type of valve 0 whose stem has no vertical movement. In this case the valvestem 1 rests in a socket 7 3 and has fixed to its shank a worm 7 4 and at a distance below the latter a collar 33, provided with a bind- IIO ing-screw 76 and carrying upon its side an inclined segmental flange 77. Fixed to the engine-bed C or other suitable support adjacent the valve stem are guides 78 79, through which slide vertical rods 80 81, whose lower extremities are fixed in an insulating-block 82. The latter carries the contact-springs 34 85,provided with contact-points 36 and 37 and forming the terminals, respectively, of wires 56 and 57. Rigidly fixed to the bars 80 81, intermediate the guides 78 79, is a block 83, carrying upon its inner end a pointer 84, which engages the worm 74;. The rotation of the stem 1 in the direction of the arrow closes the valve 0, contemporaneously causing the block 83 to travel downwardly, thereby depressing the spring 34 against the flange 77 and forcing the contact-points 36 37 together and eflecting a closure of the circuit embraced between wires 56 and 57. The flange 77 may be adjusted to contact with the spring 3 at any predetermined position during'the latters downward travel, so that the momentum of the stem 1 and its attached parts may be sufficient to force the flange 77 above the spring 34:, whereupon the latter will snap down free of the flange, leaving the latter free to revolve backward upon the reopening of the valve without contacting with the spring 34, and thereby forming a second contact of the springs 34: and 35.

Having described my invention, what claim is 1. In an apparatus of the class described, the combination with an electric circuit including a source of energy, of an electric n10- tor in the circuit, a rotatable magnet also in the circuit, a shaft upon which the magnet is mounted, a gear connection between the shaft and motor, an armature loosely mounted upon the shaft adapted to approach the magnet when the latter is energized, a wheel fixed to the armature, a rotary element to be driven, a connection between the wheel and the rotary element, means carried by the latter for breaking the circuit, and means for closing the circuit.

2. In an apparatus of the class described, the combination with an electric circuit including a source of energy, of an electric motor in the circuit, a rotatable magnet also in the circuit, pole-pieces upon the magnet provided upon their faces with non-magnetic material, a shaft upon which the magnet is mounted, a gear connection between the motor and shaft, an armature loosely mounted upon the shaft adapted to rest upon the polepieces when the magnet is energized, a driving-wheel fixed to the armature, a rotary element to be driven, a connection between the driving-wheel and the rotary element, means carried by the latter for making and breaking the circuit, and means for closing the circuit.

3. In an apparatus of the class described, the combination with an electric circuit including a source of energy, of an electric motor in the circuit, a rotatable magnet also in the circuit, a shaft upon which the magnet is mounted, gears connecting the shaft and motor, an armature loosely mounted on the shaft adapted to approach the magnet when the latter is energized, means for forcing the armature from the magnet when the energization ceases, a driving-wheel fixed to the armature, a rotary element to be driven, a 'connection between the wheel and the rotary element, means carried by the latter for breaking the circuit, and means for closing the circuit.

4. In an apparatus of the class described, the combination with an element to be driven of a circuit including a source of energy, an electric motor included in the circuit, and having an operating connection with said element to be driven, an auxiliary circuit including a circuit-closer operated by the movement of the element to be driven, thereby automatically shunting the source of energy in the main circuit and discontinuing the revolution of the motor.

5. In an apparatus of the class described, the combination with a revoluble spindle provided with a thread and an inclined flange, of an electric circuit, means in said circuit for driving the spindle, a vertically-slidable element engaging the thread upon the spindle, a circuit-closer, also in said circuit and carried by the slidable element, adapted to contact with the flange.

6. In an apparatus of the class described, thecombination withanormallyopenelectrical circuit includingasource of energy of a knifeswitch in said circuit, aprojecting cross-bar on said switch engaging a circuit-breaker, closed auxiliary circuit including an electrical alarm device, an electromagnet in the auxiliary circuit, an armature for said magnet supporting the cross-bar in open position, a normally closed circuit-breaker in the auxiliary circuit adapted to open when the armature releases the cross-bar.

In testimony whereof I have affixed my signature in presence of two witnesses.

JAMES H. CARY. Witnesses:

WILLIAM E. BROWN, HORATIO E. BELLows.

iIo 

